Intelligent entities technologically capable of traveling from even our closest Milky Way Galaxy star neighbors are not likely to be little green men or gray ones with big heads. That is because anywhere in the universe, carbon based organic lifeforms given the limiting speed of light, would not likely be able to endure the long years through space, just as we humans never will.
And no IMO, there will never be even for ancient intelligent entities billions of years old, be any wormhole hyper light speed travel regardless of how much science fiction and comic book writers demand that. Neither any matter transfer through space ala "Beam me up Scottie". What is far more likely, is being visited by ancient at least mostly non-organic artificial intelligence entities that unless physically destroyed would be essentially immortal. Such robotic lifeforms could easily endure in mostly off suspended animation states, multi hundred year trips between star systems, only waking up for periodic ops checks and maintenance.
The fact we Earth monkeys brains have within but a moment in geological time developed organic brains capable of incredible science in a universe 3 times as old as our Sun solar system with billions of galaxies, each with billions of stars, points logically towards life as ours even if rare, has already occurred many times. And as a result, intelligent organic entities arose that then developed AI just as we are now doing. Once that occurred and those entities over millions of years freed themselves from just existing about single star systems, they were essentially able to exist as a race of entities forever forward.
So what would those visiting AIs think of we homo sapiens? That the planet has incredible, fascinating, wonderful life and probably ought be protected from other advanced entities as a zoo. But once intelligent technological civilization for any creature arises, that visitation should be severely limited just as in Star Trek's prime directive lest cultural contamination occur. The last thing such moral entities would want, is to have had an influence in changing our civilizations that leads us to destruction. But if we humans on our own as it be, achieve stable peaceful existence in harmony with the rest of the planet's life, as well as be technology capable of space travel. Then they may arrive.
Then they can play back from earlier epochs they recorded of some of our history for our own amusement. Like when dinosaurs roamed, the immense creature battles of T-rex chasing all manner of kid's favorites. Or what really happened in our own early civilizations like in Egypt or China. And how they laughed at how Moses recorded various visions they gave him in an attempt to change murderous, warmongering, and immoral tendencies so many of us have. Actually I personally lean towards, some having already been at work on Earth that helped genetically evolve apes into humans. IMO, the Genesis account with a different interpretation than religions push, arguably points that way.
